The Vault of Secrets was the second serial of series 4 of The Sarah Jane Adventures. It was written by Phil Ford and directed by Joss Agnew. It featured Elisabeth Sladen as Sarah Jane Smith, Daniel Anthony as Clyde Langer, Anjli Mohindra as Rani Chandra and Alexander Armstrong as Mr Smith.
It saw the return of Androvax, and the Alliance of Shades made their live-action debut after being introduced in Dreamland.
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